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The trick is that the man is then replaced by a computer. Now the interrogator tries to determines which of the two (computer or woman) is the computer. It is a test of how well the computer can simulate a human.
There is an annual contest to see whether new computer programs can pass the Turing Test. The best attempt wins $2,000. And if any program can actually pass the test, they win $100,000.
Next time I will go into other artificial intelligence topics such as a computer playing chess.